Table of Contents
What is purpose of clamp meter?
A clamp meter is a clothespin-shaped instrument that can be clamped around a live wire in order to measure the current it’s carrying. As a measurement principle, clamp meters detect the magnetic field emitted by current flowing in a wire in order to measure the current value.
Which law is used in clamp meter?
Clamp Meter Working The electro-magnetic law defines that “when there is current flow across the conducting substance, it triggers for the development of magnetic flux”.
How does a clamp work?
Some types will use a trigger mechanism, whereby the jaws are adjusted using a trigger or lever. Alternatively, some types have a traditional screw which adjusts the clamp. When the screw is rotated, the clamp closes around the workpiece and pressure is applied to keep it firmly in place.
Can clamp meters measure DC current?
Hall Effect clamp meters can measure both ac and dc current up to the kilohertz (1000 Hz) range. Like current transformer types, Hall Effect clamp meters use rigid iron jaws to concentrate the magnetic field that encircles the conductor being measured. Its purpose is to measure magnetic flux directly.
What is the precaution of using clamp meter?
When using the probes, keep fingers behind the finger guards on the probes. Do not apply a flexible current probe around or remove from HAZARDOUS LIVE conductors. Use extreme caution when working around bare conductors or bus bars. Contact with the conductor could result in electric shock.
How does a clamp meter measure voltage?
How to make voltage measurements
- Select Volts AC or Volts DC, as desired.
- Plug the black test probe into the COM-input jack.
- Touch the probe tips to the circuit across a load or power source (in parallel to the circuit).
- View the reading, being sure to note the unit of measurement.
What is clamping and its types?
To prevent this movement, the clamp is always positioned such that work is pushed into the locators when pressure is applied. There are three basic types of cams used for clamping mechanisms: Flat eccentric, flat spiral, and cylindrical.
How do quick clamps work?
The clamp will have a quick-release lever which will allow the jaws to open when it is pressed. The moveable jaw on a lever clamp can slide along the bar, until opened or closed sufficiently to fit the workpiece. The lever is then used to increase clamping pressure..
What is the working principle of a clamp meter?
LCD Display: LCD Display is used to display the measured value. The working principle of the clamp meter is the magnetic induction principle for making AC current measurements without coming in contact with any conductor. The flow of current across a wire produces a magnetic field.
What are the jaws of a clamp meter made of?
Current transformer clamp meters are equipped with rigid jaws of made of ferrite iron. The jaws are individually wrapped by coils of copper wire. Together, they form a magnetic core during measurements. Their basic operation is like that of a transformer.
How is a DC clamp meter different from an AC meter?
A DC clamp meter is used to measure the DC currents. Whenever the DC current flowing through the wires is placed in between the clamps, the current is measured and its value is displayed. The working of DC meter is different than AC meter.
Why does the Hall effect show on a clamp meter?
The hall effect measures the constant magnetic field flowing in the core. Now in the absence of any primary winding also, the DC current will be displayed on the display. It is because of the earth’s magnetic field. Hence care must be taken to reset the device before measuring the DC current.